h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 490

• Manufacturer Part Number: h8s-2111b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

19.1
Clock pulses can be supplied either by connecting a crystal resonator, or by providing external
clock input.
19.1.1
Figure 19.2 shows a typical method of connecting a crystal resonator. An appropriate damping
resistance R
should be used.
Figure 19.3 shows the equivalent circuit of a crystal resonator. A resonator having the
characteristics given in table 19.2 should be used.
A crystal resonator with frequency identical to that of the system clock (φ) should be used.
Table 19.1 Damping Resistance Values
Table 19.2 Crystal Resonator Parameters
Rev. 1.00, 05/04, page 456 of 544
Frequency (MHz)
R
Frequency (MHz)
R
C
d
S
0
(Ω)
(max) (pF)
(max) (Ω)
Oscillator
Connecting Crystal Resonator
d
, given in table 19.1, should be used. An AT-cut parallel-resonance crystal resonator
XTAL
Figure 19.2 Typical Connection to Crystal Resonator
Figure 19.3 Equivalent Circuit of Crystal Resonator
EXTAL
XTAL
4
4
120
7
500
L
R
d
C
C
L
0
C
C
L1
L2
AT-cut parallel-resonance crystal resonator
R
s
8
200
8
80
7
EXTAL
C
L1
= C
L2
= 10 to 22 pF
10
0
10
70
7